Keith Cozart, (born August 15, 1995) better known by his stage name Chief Keef, is an American rapper from Chicago, Illinois. He has signed a major record deal with Interscope Records, and is the CEO of his own record label Glory Boys Entertainment. and his debut album Finally Rich will be released on December 18, 2012. He calls himself Sosa, which is a reference to former Chicago Cubs player Sammy Sosa.